Standoff detection of chemical plumes from high explosive open detonations using a swept-wavelength external cavity quantum cascade laser

Phillips, Mark C.; Harilal, Sivanandan S.; Yeak, Jeremy; Jones, R. Jason; Wharton, Sonia; Bernacki, Bruce E.

doi:10.1063/5.0023228

Title: Standoff detection of chemical plumes from high explosive open detonations using a swept-wavelength external cavity quantum cascade laser

Journal Article · Mon Oct 26 00:00:00 EDT 2020 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0023228· OSTI ID:1759982

^[1];

^[2]; Yeak, Jeremy ^[3]; Jones, R. Jason ^[4]; Wharton, Sonia ^[5];

^[2]

Univ. of Arizona, Tucson, AZ (United States); Opticslah, LLC, Albuquerque, NM (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Opticslah, LLC, Albuquerque, NM (United States)
Univ. of Arizona, Tucson, AZ (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A swept-wavelength external cavity quantum cascade laser (ECQCL) is used to perform standoff detection of combustion gases in a plume generated from an outdoor high-explosive (HE) open detonation. The swept-ECQCL system was located at a standoff distance of 830 m from a 41kg charge of LX-14(polymer-bonded high explosive) and was used to measure the infrared transmission/absorption through the post-detonation plume as it propagated through the beam path. The swept-ECQCL was operated continuously to record broadband absorption spectra at 200hz rate over a spectral range from 2050 to 2230 cm^-1 (4.48 - 4.88 μm). Fitting of measured spectra was used to determine time-resolved column densities of CO, CO₂, H₂O, and N₂O. Analysis of visible video imagery was used to provide timing correlations and to estimate plume dimensions, from which gas mixing ratios were estimated. Measured emission factors and modified combustion efficiency show good agreement with previously reported values.

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Research Organization:: Opticslah, LLC, Albuquerque, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: SC0019855; AC52-07NA27344; AC05-76RL01830

OSTI ID:: 1759982

Alternate ID(s):: OSTI ID: 1686242; OSTI ID: 1698299; OSTI ID: 1713330

Report Number(s):: LLNL-JRNL-811691; PNNL-SA-155885; TRN: US2206016

Journal Information:: Journal of Applied Physics, Vol. 128, Issue 16; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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